LTC2402

Features:

24-Bit ADC in Tiny MSOP-10 Package
1- or 2-Channel Inputs
Automatic Channel Selection (Ping-Pong) (LTC2402)
Zero Scale and Full Scale Set for Reference and Ground Sensing
4ppm INL, No Missing Codes
4ppm Full-Scale Error
0.5ppm Offset
0.6ppm Noise
Internal Oscillator-No External Components Required
110dB Min, 50Hz/60Hz Notch Filter
Single Conversion Settling Time for Multiplexed Applications
Reference Input Voltage: 0.1V to V_CC
Live Zero-Extended Input Range Accommodates 12.5% Overrange and Underrange
Single Supply 2.7V to 5.5V Operation
Low Supply Current (200mA) and Auto Shutdown


Application

Weight Scales
Direct Temperature Measurement
Gas Analyzers
Strain-Gage Transducers
Instrumentation
Data Acquisition
Industrial Process Control


Pinout

 

Specifications

Supply Voltage (V_CC ) to GND ..............................0.3V to 7V
Analog Input Voltage to GND ............................... 0.3V to (V_CC + 0.3V)
Reference Input Voltage to GND .......................... 0.3V to (V_CC + 0.3V)
Digital Input Voltage to GND ................................ 0.3V to (V_CC + 0.3V)
Digital Output Voltage to GND ............................. 0.3V to (V_CC + 0.3V)
Operating Temperature Range
  LTC2401/LTC2402C ........................................... 0°C to 70°C
  LTC2401/LTC2402I ............................................ 40°C to 85°C
Storage Temperature Range ................................ 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C


Description

The LTC^®2401/LTC2402 are 1- and 2-channel 2.7V to 5.5V micropower 24-bit analog-to-digital converters with an integrated oscillator, 4ppm INL and 0.6ppm RMS noise. These ultrasmall devices use delta-sigma technology and a new digital filter architecture that settles in a single cycle. This eliminates the latency found in conventional converters and simplifies multiplexed applications.

Through a single pin, the LTC2401/LTC2402 can be configured for better than 110dB rejection at 50Hz or 60Hz ±2%, or can be driven by an external oscillator for a user defined rejection frequency in the range 1Hz to 120Hz. The internal oscillator requires no external frequency setting components.

These converters accept an external reference voltage from 0.1V to V_CC. With an extended input conversion range of 12.5% V_REF to 112.5% V_REF (V_REF = FS_SET ZS_SET), the LTC2401/LTC2402 smoothly resolve the offset and overrange problems of preceding sensors or signal conditioning circuits.

The LTC2401/LTC2402 communicate through a 2- or 3-wire digital interface that is compatible with SPI and MICROWIRE^TM protocols.